

.abc() {
   display: flex;
   align-items: center;
}

@black: black;
@fontSize: 20px;

.box {
  font-size: @fontSize;
  .abc();
    justify-content: space-between;
    width: 500px;
    height: 500px;
    background-color: @black;
  
  .inner {
    .abc();
    justify-content: space-around;
    width: 100px;
    height: 100px;
    background-color: red;
    border: 1px solid black;
    color: @black;
  }
  .inner {
    background-color: green;
  }
}
